A password management service, like Dashlane or PasswordBox, can help you keep track of hard passwords. These services permit users to easily store and secure their passwords.

　　Clear your browser (浏览器) history

　　This goes for all the devices you use in a day – your home computer, your work computer, or your friend’s iPad. Internet browsers like Firefox or Chrome keep track of where you’ve been and what you've done online. 38.________ . Information about what you sent from or saved on your computer can be kept for days or weeks. It is very easy for anyone who sees that information to steal a detailed record of your online activities. 39.________ An increasing number of public places now offer free wireless access to the Internet. Often, a user does not need a password to connect to these wireless networks. These services might be useful, but they're also an easy way for hackers to access everything on your device.

　　Use anti-virus protection.

　　There are many anti-virus services available for users. 40.________ Some anti-virus services are even free. They are a great way to have a professional help keeping users one step ahead of hackers.

　　A. Hackers are better able to hack multiple accounts if those accounts all have the same password.

　　B. Be careful while using thumb drive.

　　C. They keep records of every site you visited.

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